大乘起信論裂網疏 2.12

2.12

心真如者，即是一法界大總相法門體。以心本性，不生不滅相。一切諸法皆由妄念而有差別，若離妄念，則無境界差別之相。是故諸法從本已來，性離語言，一切文字不能顯說，離心攀緣無有諸相，究竟平等，永無變異，不可破壞，唯是一心，說名真如故。

The mind's tathatā is the essence of the dharma-gate of the great general characteristic of the one dharmadhātu. This is because the fundamental nature of the mind is the mark of neither arising nor ceasing. All dharmas possess distinctions solely due to deluded thoughts; if one is free from deluded thoughts, then there are no marks of distinction among objective realms. Therefore, all dharmas from the beginning have in their nature been free from speech, cannot be overtly expressed by any written words, and, apart from the mind's cognitive grasping, have no marks whatsoever; they are ultimately equal, eternally without alteration, indestructible, and solely the one mind, and for that reason are called tathatā.